Twelve months ago Rory McIlroy went into the PGA Championship at Kiawah Island on a high, having ended a run of poor form with an encouraging tie for fifth at the WGC-Bridgestone Invitational the previous week.

Tiger Woods, expected to announce later this week that he is returning to action at the WGC-Bridgestone Invitational on Thursday week, is out of the world's top 20 for the first time since January 1997.